You didn't say which resort however from experience CSA to Kingfishpoint (tugboat) is maybe 10 mins depending on the captain. However in rougher seas it will only take a couple minutes for those prone to upchuck. May the Dive Gods give you calm seas.

CN doesn't have real long boat dives provided they have Bubbles...the dive boat. Really depends on how sensitive your wife is though. We have a lot of dives in at CN--like maybe 50 and I can only recall 2 or 3 that I thought were rough.